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What are groups of skeletal muscle cells called?
What groups are muscle fibers arranged into?
What are the long cells surrounded by their own plasma membrane called?
80% of the sarcoplasm (cytoplasm) is filled with small cylindrical organelles called _________
Which filament is composed of the contractile protein myosin?
which filament is composed of the contractile protien actin?
What is associated with the regulatory proteins troponin and tropomyosin?
thick and thin filaments
what causes striations?
arrangement of fibers
A dark region composed of thick and thin filaments is _________?
bisecting the A band is a lighter region called ______
the H zone is bisected by the ________
What light region is composed of thin filament?
what bisects the I band?
The space from one Z disc to another Z disc is called ___________?
What contains a full A band and 2 half I bands?
Sarcoplasm is filled with _____, _______ and modified _______________ called sarcoplasmic reticulum
nuclei, mitochondria (modified) endoplasmic reticulum
what wraps around the myofibrils?
The sarcoplasmic reticulum swell at certain points along the myofibril to form a __________
Running down the middle of each terminal cisternae is an inward extension called a _________
A group of 2 terminal cisternae and a T-tubule is called a _____
Fascicles are covered by connective tissue called _________
Bundles are covered by a connective tissue sheath called the ______
each fiber is surrounded by their own extracellular matrix called __________